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Unravelling Abiogenic and Biogenic Sources of Methane in the Earth's

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Unravelling Abiogenic and Biogenic Sources of Methane in the Earth's Chemical Geology 226 (2006) 328–339 www.elsevier.com/locate/chemgeo Unravelling abiogenic and biogenic sources of methane in the Earth’s deep subsurface B. Sherwood Lollar a,*, G. Lacrampe-Couloume a,1, G.F. Slater a,1, J. Ward a,1, D.P. Moser b,2, T.M. Gihring b,3, L.-H. Lin c,4, T.C. Onstott c,4 a Department of Geology, 22 Russell St., University of Toronto, Toronto, Ontario, Canada M5S 3B1 b Environmental Microbiology Group, Pacific Northwest National Laboratory, Richland WA 99352, USA c Dept. of Geosciences, Guyot Hall, Princeton University, Princeton NJ 08544, USA Accepted 5 September 2005 Abstract At four underground sites in Precambrian Shield rocks in Canada and South Africa, hydrocarbon and hydrogen gases exsolving from saline fracture waters are analyzed for compositional and isotopic signatures. Dominated by reduced gases such as CH4,H2 and higher hydrocarbons (ethane, propane, butane), the most 13C-enriched methane end-members at all four sites show a pattern of carbon and hydrogen isotopic values similar to abiogenic gases produced by water–rock interaction that have been identified previously at one site on the Precambrian Shield in Canada. The abiogenic nature of these gases was not previously recognized due to mixing with a second methane component produced by microbial processes. The microbial methane end-member is identified based on carbon and hydrogen isotopic signatures, and DNA gene amplification (PCR) data that indicate the presence of methanogens. A framework is presented to estimate the relative contribution of abiogenic versus microbial hydrocarbon gases at these sites. This approach has important implications for evaluation of potential abiogenic hydrocarbon reservoirs in a wide range of geologic settings, including the longstanding controversy concerning the possible contribution of abiogenic gases to 13 economic petroleum hydrocarbon reservoirs. The association of high concentrations of H2 with C-enriched CH4 end-members, 13 and H2 depletion in the C-depleted methanogenic end-members further suggests the possibility that abiogenic gases may support H2 autotrophy linked to methanogenesis in the deep subsurface. D 2005 Elsevier B.V. All rights reserved. Keywords: Abiogenic; Methane; Hydrogen; Autotrophy; Deep biosphere; Mars * Corresponding author. Tel.: +1 416 978 0770; fax: +1 416 978 3938. E-mail addresses: [email protected] (B. Sherwood Lollar), [email protected] (G. Lacrampe-Couloume), [email protected] (G.F. Slater), [email protected] (J. Ward), [email protected] (D.P. Moser), [email protected] (T.M. Gihring), [email protected] (L.-H. Lin), [email protected] (T.C. Onstott). 1 Fax: +1 416 978 3938. 2 Fax: +1 702 862 5360. 3 Fax: +1 850 644 2581. 4 Fax: +1 609 258 1274. 0009-2541/$ - see front matter D 2005 Elsevier B.V. All rights reserved. doi:10.1016/j.chemgeo.2005.09.027 B. Sherwood Lollar et al. / Chemical Geology 226 (2006) 328–339 329 1. Introduction workings at rates of 1 to N30 L gas/min/borehole (Sherwood Lollar et al., 1993a,b). The groundwaters Recent reports of CH4 in the Mars atmosphere fo- are typically NaCaCl-rich or CaNaCl-rich with low cussed scientific and public attention on possible geo- levels of SO4 (typically b15 ppm and always b100 logical and biological sources of these hydrocarbons ppm) with pH levels between 7–9. This study focuses (Formisano et al., 2004; Kerr, 2004). Resolving the on two sites in Canada (Kidd Creek and Copper Cliff question of the origin of atmospheric CH4 on Mars is South mines) and three in South Africa (Driefontein, even more challenging given that distinguishing abio- Kloof and Mponeng mines). Kidd Creek mine, situated genic versus biogenic sources of CH4 in the terrestrial in the southern volcanic zone of the Abitibi greenstone subsurface is still controversial (Gold, 1979; Kenney et belt (approximately 2700 Ma), 24 km N of Timmins, al., 2002; Shock, 1995). Deep subsurface fluids in Ontario is one of the world’s largest volcanogenic Precambrian Shield rocks have been shown to be dom- massive sulfide deposits. All samples were collected inated by reduced gases such as CH4 and locally, high from 2–2.1 kmbls (kilometers below land surface). The concentrations of H2 (up to 30% by volume) (Sherwood Cu–Ni ore at Copper Cliff South mine (CCS) in Sud- Lollar et al., 1993a,b). Sherwood Lollar et al. (2002) bury, Ontario is associated with a quartz diorite dike used stable isotope signatures to suggest that CH4 and offset of the Sudbury Igneous Complex — a micro- higher hydrocarbon gases (ethane, propane and butane) pegmatite, norite and quartz diorite irruptive emplaced at Kidd Creek mine on the Canadian Shield are pro- approximately 1840 Ma (Cochrane, 1984) and samples duced abiogenically by water–rock interaction such as were from approximately 1.3 kmbls. In South Africa, surface-catalysed polymerization (Anderson, 1984; Kloof, Driefontein and Mponeng mines are all located Foustoukos and Seyfried, 2004); metamorphism of west of Johannesburg in the Witwatersrand Basin — a graphite–carbonate bearing rocks (Giardini and Salotti, large Archean intracratonic basin composed of volca- 1969; Holloway, 1984; Kenney et al., 2002); and other nosedimentary sequences that unconformably overlie gas–water–rock alteration reactions such as serpentini- 3.0 Ga granitic basement. The basin is divided chrono- zation (Berndt et al., 1996; Charlou and Donval, 1993; logically into quartzite, shale and minor volcanic strata Horita and Berndt, 1999; Kelley et al., 2001, 2005; of the Witwatersrand Supergroup (2900 Ma), the basal- McCollom and Seewald, 2001; Vanko and Stakes, tic lava sequence of the Ventersdorp Supergroup (2700 1991). In this paper, data from 4 new sites in Canada Ma) and the overlying clastic and dolomitic sediments and South Africa suggests that abiogenic hydrocarbon of the Transvaal Supergroup (2400–2500 Ma) (Coward gases are more globally pervasive than has been under- et al., 1995). Almost all the samples in this study are stood previously. This is due to the fact that at many from the Ventersdorp Supergroup and are located be- sites, the distinct abiogenic signature of such hydrocar- tween 2.7 and 3.4 kmbls. The exceptions are borehole bons is obscured by mixing with microbial CH4. Based DR938H3, which while drilled in the Ventersdorp, on this data, we present a model for identification of intersects the underlying Witwatersrand Supergroup at abiogenic hydrocarbons through the resolution of mi- approximately half its 750 m length, and DR9IPC, crobial and abiogenic mixing — an approach that is which is drilled in the overlying Transvaal Supergroup applicable to a wide variety of crustal settings where and is located at 0.9 kmbls. potential abiogenic hydrocarbon reserves have been suggested (Gold, 1979; Kenney et al., 2002; Shock, 3. Methodology 1995). 3.1. Sampling methods 2. Geological setting and samples All gas and fracture water samples were collected at In gold and base-metal mines throughout the Pre- the borehole collar after the method of Sherwood Lollar cambrian Shield rocks of Canada, Finland and South et al. (2002) and Ward et al. (2004). A packer was Africa, flammable gases discharge from fractures and placed into the opening of the borehole and sealed to exploration boreholes (Nurmi and Kukkonen, 1986; the inner rock walls below water level to seal the Lahermo and Lampen, 1987; Cook, 1998; Sherwood borehole from the mine air and minimize air contami- Lollar et al., 1993a,b). Originally dissolved in saline nation. Gas and water were allowed to flow through the groundwater (TDS levels range from several 1000 to apparatus long enough to displace any air remaining in tens of 1000s of ppm) in sealed fracture systems in the the borehole or the apparatus before sampling. Plastic rocks, gases are released via depressurization into mine tubing was attached to the end of the packer and the 330 B. Sherwood Lollar et al. / Chemical Geology 226 (2006) 328–339 flow of gas and/or water from the borehole was directed concentrations of the inorganic gas components (H2, into an inverted graduated funnel. Gases collected in He, Ar, O2,CO2 and N2). To determine concentrations the inverted funnel were transferred directly into evac- of Ar, O2 and N2 the helium gas flow rate was 3 ml/min uated vials through a needle that was attached to the top and the temperature program was: initial 30 8C hold 6 of the funnel. The gas sampling vials were pre-evacu- min, increase to 80 8Cat158C/min, hold 4 min. To ated 130 ml borosilicate vials sealed with butyl blue determine CO2 concentrations, the helium gas flow rate rubber stoppers prepared after the method of Oremland was 50 ml/min and temperature program was: initial 60 and Des Marais (1983). Vials were pre-fixed with 50 8C, increase to 250 8Cat208C/min, hold 6 min. To Al of a saturated HgCl2 solution to kill any microbes determine concentrations of H2 and He, the argon contained in the sample so microbial activity post-sam- carrier gas flow rate was 2 ml/min and temperature pling would not alter the gas composition and isotopic program was: initial 10 8C hold 10 min, increase to signatures. Previous studies, comparing the isotopic 80 8Cat258C/min, hold 7 min. All analyses were run values of gases taken at the borehole collars to values in triplicate and mean values are reported in Table 1. determined for gases in solution at depth in the same Reproducibility for triplicate analyses was F5%. boreholes, showed that exsolution of the hydrocarbon gases from solution does not alter their isotopic signa- 3.3. Isotopic analysis tures (Sherwood Lollar et al., 1993a,b, 1994). For the South African sites, the packer was sterilized Stable carbon and hydrogen isotopic analysis for all by autoclaving before insertion into the borehole in hydrocarbons were performed at the University of Tor- order to reduce the possibility of introducing surface onto (Table 2).
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